Development and Characterization of High Temperature Superconducting Wire for Superconducting Cable System

Title & Authors
Development and Characterization of High Temperature Superconducting Wire for Superconducting Cable System
Mean, Byoungjean; Lee, Jae-Hun; Kim, Young-Soon; Lee, Hunju; Moon, Seung-Hyun;

Abstract
In order to improve the properties of high-temperature superconducting wire for superconducting cable system, we optimized the electro-polishing (EP), ion-beam assisted deposition (IBAD), superconducting (SC) layer, and baking (heat) treatment. The buffer layer was deposited on electro-polished substrate with RMS roughness ($\small{R_{RMS}}$) less than 5 nm. The IBAD process was carried out at $\small{V_{beam}}$: 1100 V and $\small{V_{accel}}$: 850 V that resulted in highly crystalline film of $\small{LaMnO_3}$. Chemical composition of SC layer is key to higher critical current, and we found that composition can be determined by surface color of SC layer. We adopt a proprietary contorl system based on RGB analysis of the surface and achieved critical current of 150 A/4 mm-width. The proposed baking treatment resulted in decreasing of about 10% of fraction defects.
Keywords
Superconducting wire;reactive co-evaporation;cable;critical current;
Language
Korean
Cited by
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